What is Opportunity cost? And why haven’t they really emphasized this for finances?

Liquidity: How to access your retirement savings throughout your whole life.

If you think that uncle sam had other ideas up his sleeve to get at your retirement savings…you were right? But, there is a way that has been in place for well over 100 years. All the rich, the bankers and other people that have been in the “know”, have been doing this one thing for a long, long time now.